Gas-engine admission-valve.



, Patented Sept. 28, 1909.

2 SHEETS-SHEET 1.

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e. B. PETSGHE.

, GAS ENGINE ADMISSION VALVE.

APPLIQATION FILED OCT. 26, 1907.

Patented Sept. 28, 1909.

2 SHEETS-SHEET 2.

. O ATTORNEY.

' ig E 11 8264252 1.

' To all whom it'may co'ric'm:

J UNITED STATES PATENT onto.

FOUNDRY AND MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A COR- PORATION OF PENNSYLVANIA.

GAS-ENGINE ADMISSION-VALVE.

Be it known that I, GUSTAV B..'PETSCHE, a subject of'the' Egneror-of Germany, residing in the city an in the State of Pennsylvania, have invented a certain new and useful Improvement in v Gas-Engine Admission-Valves, of which the following is a. true and exact description, reference being had to the accom anying drawings, which form a part thereoB The present invention relates to the admission valves of gas engmesfand particularly to that type of admission valve in which the.

, admission valve structure is provided with a mixing chamber having air and gas inlet ports and an outlet port communicating with the inlet port proper of the corresponding combustion chamber, and in which the outlet port from the mixing chamber is controlled by a main valve vand the admission of air and gas to the mixing chamber is controlled by a distribution valve.

v The object ofthepresent invention is to provide simple and effective mechanismby which the movement of the main valve into and out of the open position tends to give corresponding movements to the distribution valve, and the provision of reliable and easily regulated means for controlling the movements. ofthe distribution valve.

In carrying out the ih'vention I provide a structure in which the main and distribution valves are connected by a piston carried by the one and a cylinder having aclosed end carried by the other into which the piston extends, whereby 'a vacuumis formed in the cylinder when the main valve is moved without a'corresponding movement of the distribution valve. In addition, I also provide means adapted for ready governor control for governing the movement of the distribution valve when the main valveopens.

By preference, the last mentioned mechanism includes means by which the distribution valve is locked or held in the initial position until the time at which it is pro er for the distribution valve to move, an is then allowed to move freely to the extent of its movement.

The locking or holding means maybe constructed in various ways. In one form of the invention, which'in some respects I regard asthe preferable one, the locking means comprises a closed cylinder end fori'ned 1n county of Philadelphia,

valve for admittingalr at they to the closed cylinder end. The 4 or other lockin means may as g valve as elecherewit'h, but I do not regard my invention as being limited in all of its aspects to any particular form of pilot valve controlling means. Y A I I The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed. to and forming a part of this specification. For a better understanding of lay-invention,

ter in which I have illustrated and described various forms in which the invention may be embodied. I a

In the drawings, Figure 1 is a sectional elevation of one form of my invention. Fig. 2 isa plan viewon a smaller scale of the: valve shown .in Fi 1.. Fig. 3 is .a view similar to Fig. 1, s owing a modified construction, and Fig. 4 is a partial view taken similarly to Fig. 1, showing a third form of the invention.

Inthe drawings, -and referring first to represents the valve casing which .is connected to theengine structure D through an annular seat member A The admission chamber A the lower portion of which "forms a-mixingchamber which communiber' with-the main inlet port D of the cor- 'cas1ng .is provided with gas andair inlet passages B and C respectively which extend 'cate throu h B and C with the mixing chamber.

controlled by the main valve seat .on the seat A of the valve seat member A The'stem E of the main valve is provided at its up erend with suitable con: nections E by w ich it maybe connected to the valve structure or a piston formed onthe distribution valve and enterin said chamber and a governor controlled pi1ot er time around'the mixing chamber and communi- Specification-of Letters Patent. Patented Sept. 28, 1909'."- Application filed October 26, 1907. Serial No. 399,286.;

trical-ly control ed, as by the means. disclosed. and claimed in my copencling appli; I cation, Serial N 0. 399,285, filed of even date however, reference may be lla(l tl) the accompanying drawings and descriptive matthe construction shown in Figs. 1 and 2, A.

valve casing A is formed with a cylindrical cates' at the lower end of, the valve s'eatmemresponding combustion chamber. The valve;

ommunication between the mix ing chamber A and the ,inlet plassageb 18 adapted to the engine vvalve gear- The stemL'Ef' has secured on a member F provided with a cylindrical portionFhaving ports F and F adapted to be broughtinto and out of register with the ports Bf and C as the valve E is in the open position shown in F is separated from the wall of the mixing chamber by the cylindrical shell portion G of the distribution or fuel supply regulat-v ing valve G which is provided at its upper end with the tubular extension G surrounding the extension F and fitting in the valve casing A The upper end of the distribution valve forms a piston portion which is slidingly fitted in the piston chamber formed by the u aper end of the chamber A. The member G. as formed in it a chamber G in which the'piston F4 is slidingly fitted.

The cylindrical shell G 'is provided with ports Gr and G which, when the parts are in the position shown in Fig. '1, with the main valve open and the distribution valve in the closed position, are in register with the ports B, F, and the ports C. and F respectively. For the purpose of avoiding alternate compression and expansion in the chamber Gr located ,above the portion F of -the, member F-and surrounding the piston F, a communicating annular passage G6 is formed in the member G, "and radial ports Gr lead from the passage G? to an annular passage G formed in the periphery of the member Gr. Air is freely admitted to the passage Gr through one or more ports G I formed in the valve casing A. The admission of'air to the piston chamber formed by the upper portion of the chamber A is .controlled by means of. the pilot valve member H adapted to closethe port H formed in the pilot valve H, and in register with the port A leading through the upper Wall of the valve casinginto the upper end of the chamber ,A. The pilot valve H, in the form shown in Fig. l, is slidingly supported in' the frame extension H and is lifted at the proper time through the lever H carrymg at one end the armature H whichis att racted toward the core H when the electrical winding H is supplied with current. The operation of the structure shown in Fig. 1 is as follows: The inlet valve E is alternately moved away from and back to the seat A by the regular engine valve gear, so

that the valve opens at one predetermined stage in the engine movement and closes at another predetermined stage in the engine movement. It will be understood by those skilled in the art that suitable-means may be provided for adjusting the points in the engine piston movement at which the mam valve opens and closes. The movement of the main valve from the open to the closed position does not move the distribution valve so long as the valve H" remains on its seat on account of the excess in area of the upper end of the valve G over the area of the corresponding end of the piston F. When, however, the winding H is energized and the armature H attracted with corresponding opening of the pilot valve, air enters the upper end of the chamber A and the valve is immediately moved inward on account of the vacuum which has been the valve Gr drops it cuts off communication between the ports F 2 and B. \Vhen the valve-E is thereafter returned to the closed position the distribution valve G- is returned with it. The pilot valve H then serves as a check valve permitting the air inthe chamher A above the valve G to flow out, the winding H being deenergized by this time. As atmospheric air canpass freely into and out of the chamber G through ports G, Gr and G there is no tendency to suck the fuel mixture into'the space G when the main valve opens. This is of importance, particularly as it avoids any fouling by the fuel mixture of the sliding contact surfaces of the upper ends of members G and F, and

thereby facilitates contact surfaces.

The valve of Fig. 3 difi'ers from that of Figs. 1 and 2 primarily in the fact that in the construction of Fig. 3 the distribution valve is held in its initial position by a sliding bolt J which is mounted in a slideway formed in the upper end of the valve casing and has its inner end shaped to enter a groove Gr formed in the stem G of the valve-G and thereby latch the latter in the initial position. The bolt J may be oper ated in any suitable manner. For instance, as shown, it may have attached to its outer end an arnmturc J normally spring pressed inward by. the spring J but moved outward at the proper time by the pull of the electrical winding J when the latter is energized. The winding J is supported in a casing J,- which may be attached to the valve casing. The upper end of the distribution valve G- in this form of my invenproper lubrication of the in the initial structure fortion does not make a close fit in the upper end of the mixing chamber of the valve, and there is no air lock action holding the member in the initial upper position.v In this form of my invention, also, the operation of the distribution valve is as follows: When the-valve G is held in the initial position air can pass freely from the air inlet passage C to thecombustion chamber of the enand, at this time communication is cut omitted. On this account, .no ports Gr are provided in the member G, as in the con- .struction of Fig.1.

The construction shown in Fig. 4 differs from that of Fig.1 merely in the means employed for locking the distribution valve outer position. In this form of the nvention, as in that of Fig. 2, the upper end of the member G does not fit tightly in the upper end of the mixing chamber but is held in the initial position when desired by magnetic action. The upper end of the valve casing proper is closed by a cap A" having located in itan annular Winding K which surrounds a central boss A projecting downward from the upper end of the member A, the boss surrounding the reduced outer end G of the member G. The winding K is retained in place by an annular member K of'non-magnetic material, which is threaded into the cap member A. .In this form of the invention, theupper end of the member G forms in efiect the armature of an electro-magnet, and is attracted and held 1n the position shown in Fig. 4; so long as the winding K remains energized. When the winding K is tion valve member ward under the action of the piston F t and vacuum chamber Gr connection, as. in the other constructions.

Having now described my, invention, what -I claim as'new and desire to secureby Letters Patent is: 1. In combinatlon 1n an admission valve and distribution valve controlled ports, a main valve, a distribution valve, means tend: ing to move the distribution valve away from an initial position when the main valve is open, said means comprising a piston {carried by one of saidvalves which'enters a piston chamber formed in the other valve,

7 beingso arranged that when the main valve. is moved piston chamber formed in is throttled, and "gas is from its denergized the distribu- G is free to move downgas engines formed with main.

to the open position and the distribution valve remains stationary, a vacuum is ,t'ormed in said chamber, and means for releasably holding the'distribution valve in said initial position.

2. In combination in an admission valve structure for gas engines formed with main and distribution valve controlled ports, a main valve, a distribution valve, means tending to move the distribution valve away from itsinitial position whenythe main valve is open, said means comprising a piston carried by one of-said valves which enters an the other valve, the piston and piston chamber being so arranged that when the main valve is moved into the open position and the distribution valve remains stationary, a vacuum is formed in said chamber, and electricallycontrolled means for releasably holding the distribution valve in the initial posit-ion.

3. In combination in an admission valve structure for gas engines formed with main and distribution valve controlled ports, a main valve, a distribution valve, means tending to move the-=distribut1on valve away ried by one of said valves which enters a piston chamber formed in the other valve,, the piston and piston chamber being so arranged that when the main valve is moved into the open position and the distribution valve remains stationary, a vacuum is' formed in said chamber, and means for releasably holding the distribution valve in its initial position, said valves being proylded with surfaces which engage'when the main .valve is off its seat and the distribution valveis out of its initial position, whereby when the main valve is returned to its seat the distribution valve is returned to its initial position. 4

4. In combination an admission valve structure for gas engines formed with main and distribution valve controlled ports and with a piston chamber having a port leading into it, a main valve, a distribution valve, means tending-to move the distribution valve away from the initial osition when the main valve is moved off its seat, said means comprising a piston carried by one of said valves which enters the piston chamber formed in the, other .valve, the piston and I piston chamber being so arranged that when the main valve is moved off its seat and the distribution valve remains stationary a vacuum 1s. formed in said chamber, and means for .releasably holding the distribution valve in the initial position,

said means comprising a pistonj-portmn carried by the distribution valve whichent-ers chamber, and .a valve controlling the admission of air through the port leading to said first mentioned-piston chamber.

initial position when the main valve [11s open, said means comprising apiston carthe first mentioned piston port and a distribution valve controlling the inlet ports, one of said valves being provided with a piston chamber, -m'eans" tending to move the distribution valve away from the initial position when the main vvalve is moved ofl its seat, said means comprising a piston carried by the other of said valves which enters the piston chamber formed in said one valve, the piston and chamber being so arranged that when the main valve is moved ofi' its seat and the distribution valve remains stationary a vacuum is 'formed in said chamber, and means'for releasably holding the distribution valve in its initial position, said, means, comprising a valve controlling the port leading to the first mentioned piston chamber and arran ed to serve as a nonreturn valve normal y preventing the admission of air to said chamber but allowing it to escape freely therefrom, and means for opening said valve to allow a to enter said chamber.

-6. In combination, an admission valve structure for gas engines formed with main and distribution valve controlled ports, a main valve E having secured to it a member F formed with a piston portion F", and a cylindrical ported portion F of larger diam eter than the piston portion F at one end of the piston portion F, a distribution valve G provided with a cylindrical ported portion G surrounding said cylindrical portion F and formed with a piston chamber G closed at one end and into the other 'end of which the piston F extends and is fitted, said valve structure and member G being provided with ports at all times freely admitting air into the space in the member G surrounding the member F and at the ad'- jacent end of the cylindrical portion F.

- GUSTAV B. PETSCHE. Witnesses:

ARNOLD KATZ, S. STEWART. 

